Merge pull request 'Add liveness check endpoint' (#1) from feature/health_check_endpoint into master

Reviewed-on: #1

scripts/health.js

@@ -0,0 +1,5 @@
+module.exports = function (robot) {
+  robot.router.get('/health/live', (req, res) => {
+    res.send('OK');
+  });
+}